dies when wipers are on.

[94f450sd]

I have 2 99 7.3s tha run fine all day long till the wipers are turned on.theyll stall,start and run as long as the wipers are off.

 

[94f450sd]

Thinkin water running down into the idm.i ran a hose on the corner of the glass with no effect.turned wipers and it died.

 

[snicklas]

Or a grounding issue? Sounds like something feeding back and the PCM is seeing it as a shutdown, or maybe getting +V on both sides.... so it is shutting it down.... like when the TECA sees +5 from the FIPL it will go into limp mode????

 

[94f450sd]

Somebody told the owner it was the cps.i put an aftermarket cps in it,same thing.somebody replaced it recently as well.

A google search also came up with the cps being bad.i had him get me a cps from IH.gonna try that.if not,gonna try a wiper motor.

Strange.never heard of this before

 

[79jasper]

Usually cps. You can give the wiper motor a good ground also.

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[94f450sd]

The ford/ih sensor seems to have fixed it.been running 20 minutes with the wipers going with no hiccups

 

[79jasper]

Even the normal motorcraft one is now straight outta China.
A lot are having good results with one from advanced auto. The ih should be good.

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[greenskeeper]

aftermarket CPS are know to do this, the solution if you want to keep the CPS is to add a choke to the wiper circuit

 

[94f450sd]

Havent heard from him.been rainy all day.the ih sensor must be doin good.i had him throw the original sensor in the glovebox and explained why.

Thats just wierd.i have never heard of that before.i have another 99 that the driver was saying dies only in the rain.now i can fix that one.

 

[IDIoit]

well thats just odd.
thanks, now i can keep that info in the back of my brain.

 

[OLDBULL8]

Go to Radio Shake and get some chokes, install over both wires close to the motor. Chokes are used on all kinds of computer related equipment to absorb stray frequency signals.